Parquet theory is formalized for molecules with a static kernel approximation that treats all scattering channels equally and is tested on ionization potentials of small systems.
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SZ-QCT relaxes the small-generator limit of prior seniority-zero methods by retaining approximate four-body operators, yielding sub-millihartree accuracy for strongly correlated systems at O(N^8) scaling.
SZ-LCT uses a BCH-expanded unitary transformation with a generator chosen to minimize non-seniority-zero Hamiltonian elements, achieving submilliHartree accuracy for strongly correlated electrons at O(N^8/n_c) scaling.
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Parquet theory for molecular systems: Formalism and static kernel parquet approximation
Parquet theory is formalized for molecules with a static kernel approximation that treats all scattering channels equally and is tested on ionization potentials of small systems.
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Seniority-zero Quadratic Canonical Transformation Theory
SZ-QCT relaxes the small-generator limit of prior seniority-zero methods by retaining approximate four-body operators, yielding sub-millihartree accuracy for strongly correlated systems at O(N^8) scaling.
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Seniority-zero Linear Canonical Transformation Theory
SZ-LCT uses a BCH-expanded unitary transformation with a generator chosen to minimize non-seniority-zero Hamiltonian elements, achieving submilliHartree accuracy for strongly correlated electrons at O(N^8/n_c) scaling.